Question

The diagram below is used to prepare nitrogen (IV) oxide gas.

1.  Identify substance V 
2. State and explain one precaution taken when carrying out the experiment.

Answer 1

1.  Identify substance V 
   • Concentrated Sulphuric(VI) acid//H₂SO_4(l)
2. State and explain one precaution taken when carrying out the experiment. 
   • The experiment should be done in a fume chamber or in open air
   • The gas (NO2) is poisonous